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List of results

• ML13331A232  + (ML13331A232)
• 05000206/LER-1987-015-02, :on 871007,determined That Engineered Safety Sys Design Failed to Meet Single Criteria.Caused by Newly Identified time-dependent Single Failure Susceptibilty. Special Operator Training Provided  + (ML13331A233)
• ML13331A234  + (ML13331A234)
• 05000206/LER-1987-005, :on 870324,nuclear Instrumentation Sys Power Range Channel 1207 Declared Inoperable.Channel Placed in Trip Condition.On 870428 & 29,Channel 1207 Automatically Reset from Trip to Inoperable Condition  + (ML13331A235)
• 05000206/LER-1987-014-02, :on 870626,determined That Battery Weekly Surveillance Not Performed Prior to Mode Change,Contrary to Tech Spec 4.0.4.Caused by Personnel Error.Individual Involved Reinstructed  + (ML13331A236)
• 05000206/LER-1987-016-02, :on 871110,Automatic Switch Co Solenoid Valve Failures Occurred.Caused by Thin Hard Film Between Top of Slug & Housing.Root Cause Evaluation Continuing.Further Testing Performed  + (ML13331A237)
• 05000206/LER-1987-003-01, :on 870310,turbine & Reactor Trips Occurred as Result of Trip Signal in Response to Generator Field Loss. Caused by Electrical Short Resulting from Brush Being Dropped in Main Exciter Commutator Assembly  + (ML13331A238)
• 05000206/LER-1987-017-02, :on 870910 & 1201,containment Isolation Valves Loop B Header Would Not Fully Close Upon Demand.Cause Undetermined.Administrative Controls Implemented to Prevent Inadvertent Opening of Valves  + (ML13331A239)
• 05000206/LER-1986-014, :on 861230,ground Alarm Received in Control Room for Dc Bus 2.Opening Feeder Breaker Constitutes Brief Entry Into Tech Spec 3.0.3.Caused by Moisture in Control Circuitry Junction Box.Ground Cleared  + (ML13331A240)
• 05000206/LER-1986-011, :on 860904,main Feedwater Pump Failed.Caused by Loss of Thrust Disk Assembly Preload.New Assembly Instructions Developed to Avoid Loss of Preload.Vibration Amplitude Will Be Monitored  + (ML13331A241)
• 05000206/LER-1987-018-01, :on 871216,Tech Spec 3.0.3 Voluntarily Entered During Dc Ground Troubleshooting.Caused by Presence of Water Inside Housing of Solenoid.Ground Eliminated by Drying Electrical Connections  + (ML13331A242)
• ML13331A243  + (ML13331A243)
• ML13331A244  + (ML13331A244)
• ML13331A245  + (ML13331A245)
• ML13331A246  + (ML13331A246)
• 05000206/LER-1988-001-02, :on 880225,several Components Requiring Environ Qualification Found Omitted from Equipment Qualification Master List.Caused by Inadequate Methodology During List Generation.Installed Equipment Reviewed  + (ML13331A248)
• ML13331A249  + (ML13331A249)
• 05000206/LER-1988-002-02, :on 880317,Tech Spec Continuous Fire Watch for Containment Interrupted When Equipment Hatch Closed.Caused by Removing Contiguous Area from Combination Post When Hatch Closed.Instructions to Be More Explicit  + (ML13331A250)
• ML13331A251  + (ML13331A251)
• ML13331A252  + (ML13331A252)
• ML13331A253  + (ML13331A253)
• 05000206/LER-1988-006-01, :on 880321,discovered That Backup Nitrogen Sys (Bns) Design Criteria Had Not Been Fully Implemented in Design & Installation of Sys.Caused by Surveillance of Bns Not Being Performed.Changes Instituted  + (ML13331A254)
• 05000206/LER-1988-005-01, :on 880329,review of Tech Spec 4.15 Surveillance Procedures Revealed Two Valves Not Adequately Addressed in Surveillance Program.Caused by Oversight. Procedures Will Be Revised  + (ML13331A255)
• ML13331A256  + (ML13331A256)
• ML13331A257  + (ML13331A257)

• ML13331A258  + (ML13331A258)

• 05000206/LER-1988-007-01, :on 880206 & 07,failed to Retain Sample from Ctr Holdup Tank.Caused by Inadequate Chemistry Cintrols. Amend Requiring Verification of Retained Sample Releases Planned & Average of Jan-Mar Values to Be Used  + (ML13331A260)
• 05000206/LER-1987-015, :on 871007,determined That ESF Designs Failed to Meet Single Failure Criteria.Cause Re motor-operated Valve MOV-883 Due to Failure to Review Affect of Revised Single Failure Regulatory Guidance  + (ML13331A261)
• 05000206/LER-1988-009-01, :on 880526,determined That Max Electrical Load Imposed on Diesel Generators in Excess of Tech Spec 4.4 Limit.Cause Under Investigation.Members Involved Have Reviewed Event & Received Training  + (ML13331A262)
• PNO-V-88-042, on 880626,magnitude 4.7 Earthquake Occurred. Telephone Contact Established That Earthquake Not Felt,No Damage Identified,No Releases of Radioactivity Occurred & Seismic Instrumentation Operable & Did Not Respond  + (ML13331A264)
• ML13331A265  + (ML13331A265)
• ML13331A266  + (ML13331A266)
• 05000206/LER-1988-010-01, :on 880625,inadvertent Starting of Diesel Generator 2 Occurred When Inner Compartment Door of Breaker Cubicle Opened.Caused by Personnel Error.Locking Devices to Be Installed on Inner Compartment Doors  + (ML13331A267)
• 05000206/LER-1988-011-01, :on 880724,containment Isolation Sys Train a Actuation Occurred Due to Loss of Power to Vital Bus (VB) 1. Caused by Improper Installation of Breaker/Bus Connection. VB 1 Supply Breaker Replaced  + (ML13331A268)
• 05000206/LER-1987-011-01, :on 880728,spurious Actuation of Containment Isolation Train a Occurred W/Isolation Valves Verified Properly Closed.Caused by Broken Instrument Electrical Solder Connection.Procedures Modified  + (ML13331A270)
• 05000206/LER-1988-013-01, :on 880806,east Main Feedwater Pump Safety Injection Recirculation Valve CV-875A Observed Leaking Feedwater to Refueling Water Storage Tank.Caused by Valve Not Seating Properly in Closed Position  + (ML13331A271)
• 05000206/LER-1988-012-01, :on 880808,determined That Loop a Feedwater Signal Erroneously Low.Possibly Caused by Orifice Plate Being Installed Backwards.Procedure Revised Requiring Highest Flow Be Used for Feedwater Flow Inputs  + (ML13331A273)
• ML13331A274  + (ML13331A274)
• ML13331A275  + (ML13331A275)
• 05000206/LER-1987-006, :on 870513,insp Per IE Info Notice 86-104 Found wide-range Containment Water Level Instrumentation in non-environ Qualification Configuration.Caused by Personnel Error.Training Program Initiated  + (ML13331A276)
• ML13331A277  + (ML13331A277)
• 05000206/LER-1988-006, :on 880321,determined That Portions of Backup Nitrogen Sys Design Basis Not Fully Implemented in Design & Installation of Sys.Caused by Procedures Badly Supporting Design Requirements.Procedures Revised  + (ML13331A279)
• 05000206/LER-1988-009, :on 880526,potential Diesel Loads in Excess of Regulatory Commitments.Caused by Calculation Errors & Inadequate Understanding of Loads on Diesel Generator. Personnel Trained in Proper Methodology  + (ML13331A280)
• ML13331A281  + (ML13331A281)
• ML13331A282  + (ML13331A282)
• PNO-V-88-062, on 881119,earthquake Occurred 30 Miles West of San Clemente,Ca.Earthquake Felt by Personnel in Unit 1 Control Room & No Seismic Instrumentation Alarms Received. Licensee Found No Damage After Visual Insp of Unit 1  + (ML13331A283)
• 05000206/LER-1988-008-01, :on 880524,inadvertent Omission of Safety Injection Vent Valves from Local Leak Rate Testing Program. Caused by Valves Associated W/Penetration E15 Omitted from Local Leak Rate Testing Program  + (ML13331A284)
• ML13331A285  + (ML13331A285)
• 05000206/LER-1987-017, :on 871201,remotely Operated,Normally Closed, Containment Isolation Valves in Vent Line Did Not Close Upon Demand Upon Completion of Venting of Loop B Header.Seats of Valves Found Worn & Warped.Valves Replaced  + (ML13331A286)
• 05000206/LER-1988-004-01, :on 880215,bonnet Bleed Off Solenoid Valve SV-3900,for Safety Injection Isolation Valve HV-851B,failed to Open.Caused by Crack in Sleeve in Which Valve Disc Moves on Opening  + (ML13331A287)
• ML13331A288  + (ML13331A288)